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Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 611,340 | $ 598,686
Accumulated Amortization | (352,520) | (335,507)
Intangible Assets, Net | $ 258,820 | 263,179
Remaining Weighted Average Amortization Period in Years | 8 years 9 months 1 day |
Intangible Assets | $ 614,340 | 598,686
Intangible Assets, Net | 261,820 | 263,179
Engineering license |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible Assets | 3,000 | 0
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | 326,181 | 327,334
Accumulated Amortization | (150,677) | (137,333)
Intangible Assets, Net | $ 175,504 | 190,001
Remaining Weighted Average Amortization Period in Years | 6 years 9 months |
Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 135,772 | 136,266
Accumulated Amortization | (134,885) | (135,847)
Intangible Assets, Net | $ 887 | 419
Remaining Weighted Average Amortization Period in Years | 8 months 12 days |
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 80,279 | 74,797
Accumulated Amortization | (19,289) | (17,057)
Intangible Assets, Net | $ 60,990 | 57,740
Remaining Weighted Average Amortization Period in Years | 15 years 9 months 15 days |
Non-compete agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 37,601 | 37,760
Accumulated Amortization | (28,843) | (27,659)
Intangible Assets, Net | $ 8,758 | 10,101
Remaining Weighted Average Amortization Period in Years | 3 years 7 months 1 day |
Patented rights and developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 22,507 | 22,529
Accumulated Amortization | (18,427) | (17,611)
Intangible Assets, Net | $ 4,080 | 4,918
Remaining Weighted Average Amortization Period in Years | 2 years 10 months 20 days |
Curriculum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible Assets | $ 9,000 | 0
Accumulated Amortization | (399) | 0
Intangible Assets, Net | $ 8,601 | $ 0
Remaining Weighted Average Amortization Period in Years | 9 years 7 months |

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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